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d64plus: Re-implemented RAM banks into SAM address space.

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This commit is contained in:
Nigel Barnes 2021-02-25 17:20:43 +00:00
parent 8cedb2dc52
commit ee053dd850
2 changed files with 24 additions and 6 deletions
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4
src/mame/includes/dragon.h
View File

@ -117,6 +117,8 @@ public:
, m_palette(*this, "palette")
, m_plus_ram(*this, "plus_ram", 0x10000, ENDIANNESS_BIG)
, m_video_ram(*this, "video_ram", 0x800, ENDIANNESS_BIG)
, m_pram_bank(*this, "pram_bank")
, m_vram_bank(*this, "vram_bank")
, m_char_rom(*this, "chargen")
{
}
@ -135,6 +137,8 @@ private:
required_device<palette_device> m_palette;
memory_share_creator<uint8_t> m_plus_ram;
memory_share_creator<uint8_t> m_video_ram;
memory_bank_creator m_pram_bank;
memory_bank_creator m_vram_bank;
required_memory_region m_char_rom;
};

26
src/mame/machine/dragon.cpp
View File

@ -182,18 +182,19 @@ uint8_t d64plus_state::d64plus_6845_disp_r()
void d64plus_state::d64plus_bank_w(uint8_t data)
{
address_space &space = m_maincpu->space(AS_PROGRAM);
switch (data & 0x06)
{
case 0: // Standard Dragon 32 Dynamic bank
space.install_write_bank(0x0000, 0x7fff, membank(":sam:bank0000_w"));
space.install_read_bank(0x0000, 0x7fff, membank(":sam:bank0000_r"));
m_pram_bank->set_entry(0);
m_vram_bank->set_entry(0);
break;
case 2: // First extra 32K bank (A)
space.install_ram(0x0000, 0x7fff, m_plus_ram + 0x0000);
m_pram_bank->set_entry(1);
m_vram_bank->set_entry(1);
break;
case 6: // Second extra 32K bank (B)
space.install_ram(0x0000, 0x7fff, m_plus_ram + 0x8000);
m_pram_bank->set_entry(2);
m_vram_bank->set_entry(2);
break;
default:
logerror("unknown bank register $FFE2 = %02x\n", data);
@ -201,7 +202,7 @@ void d64plus_state::d64plus_bank_w(uint8_t data)
}
if (data & 0x01)
{
space.install_ram(0x0000, 0x07ff, m_video_ram); // Video RAM bank (C)
m_vram_bank->set_entry(3); // Video RAM bank (C)
}
}
@ -237,6 +238,16 @@ void d64plus_state::device_start()
{
dragon64_state::device_start();
m_sam->space(0).install_readwrite_bank(0x0000, 0x7fff, m_pram_bank);
m_sam->space(0).install_readwrite_bank(0x0000, 0x07ff, m_vram_bank);
m_pram_bank->configure_entry(0, m_ram->pointer());
m_pram_bank->configure_entries(1, 2, m_plus_ram, 0x8000);
m_vram_bank->configure_entry(0, m_ram->pointer());
m_vram_bank->configure_entries(1, 2, m_plus_ram, 0x8000);
m_vram_bank->configure_entry(3, m_video_ram);
address_space &space = m_maincpu->space(AS_PROGRAM);
space.install_readwrite_handler(0xffe0, 0xffe0, read8smo_delegate(*m_crtc, FUNC(mc6845_device::status_r)), write8smo_delegate(*m_crtc, FUNC(mc6845_device::address_w)));
space.install_readwrite_handler(0xffe1, 0xffe1, read8smo_delegate(*m_crtc, FUNC(mc6845_device::register_r)), write8smo_delegate(*m_crtc, FUNC(mc6845_device::register_w)));
@ -251,4 +262,7 @@ void d64plus_state::device_start()
void d64plus_state::device_reset()
{
dragon64_state::device_reset();
m_pram_bank->set_entry(0);
m_vram_bank->set_entry(0);
}